Unloader for fluid-compressors.



W. PRELLWITZ.

UNLOADI'IR FOR FLUID COMPRESSORS.

APPLIOATION FILED MAE. s, 1911. 1 027,7 0, 7 Patented May 28, 1912 5 SHEETS--SHEET 1.

W. PRBLLWITZ. UNLOADER FOR FLUID UOMPRESSORS.

@APPLICATION FILED MAR. 8, 1911.

1,027,760. Patented May 28, 1912.

5 SHEETS-SHEET 2.

W. PRBLLWITZ.

UNLOADER FOR FLUID GOMPRESSORS.

APPLICATION IILED MAIL. a, 1911.

1,027,760, I Patented May 28, 1912.

5 SHEETS-$111311 3.

W. PRELLWITZ.

UNLOADER FOR FLUID GOMPRESSORS,

APPLICATION FILED MAR 8, 1911.

Patented May 28, 1912.

SHEET 4.

5 SHEETS ed m IIIIH'III n IIIIIHI Rx 1 ///VII w Ii wppmLLwiTz. UNLGADER FOR FLUID GOMPRBSSORS.

APPLICATION FILED MAR. 8,1911.

1,027,760. Patented May 28, 1912;

5 SHEETSBHBET 5.

"UNITED saaa asf aaruutr OFFICE.-

WILiLIAM raunawmz, or PENNSYLVANIA, assmuon TO INGEBSOLL- aauo COMPANY, or tau-w. roux, :u. ax, a ooaroaarrou or NEW JERSEY.

ounoapm r03 FLUID-COMYRESsOBS.

To all whom it may concern:

Be it known that I. WILLIAM Paisnnwrra fluid compressors and has for one of its ohects the provision of a simple regulating device for controlling the loading and unloading of the pumpingmechanism of a compound fluid compressor at successively attained pressures.

- Another object is to provide a fluid pressure governed regulator having means such as an auxiliaryvalve, arranged to successively operate a plurality of main regulator valves which control the loading and unloading of the compressor pumping mechanism.

'A still further object is to provide certain improvemente in the, construction, form, :i'r rangement and operation of the several parts whereby the results are obtained in a simpler and more ellicient manner.

A practical embodiment of this invention is represented in the accompanying draw-- ings, in Whi' ':h-

' Figure 1 is a top plan view of a duplex compound fluid compressor of the two-stage type With my invention applied thereto, the intercooler andreceiver not being shown, Fig. 2 is a side view of the compressor with a portion of the some broken away to more clearly illustrate parts Within the same, Fig. 2 is an enlarged detail longitudinal section through one of the auxiliary receiver valves and its adjacent parts, Fig. 3 is an end view of the compressor, Fig. 4 is an enlarged detail view partially in section of my improved regulator, Fig. 5 is a sectional view taken at right angles to Fig. 4, Fig. (3 is a transverse longitudinal central section through the auxiliary valve chest, Fig. 7 is a side View of the same, Fig 8 is a n outer face view of the port plate which-is interposed between the auxiliary valve chest and the main valve chest,

Fig. 9 is an inner face view of the port plate,'

and Fig. 10 is a face view of the main valve chest. with the auxiliary volt-e chest and port plate removed.

' I have chosen to illustrate my invention in connection with a duplex compound fluid I Specification otI-gttcrs latent. Application filed March it, 1913.. Fierialfflo. 613,037.

Patented May 28,1912.

The low pressure cylinder is denoted by 1,.

the high pressure cylinder by 2 and the motor for driving the compressor by The mtercooler is denoted by 4.

The low pressure cylinder 1 is provided with the usual dischar e valves 5 and 6 at its inner and outer en s and the high pressure cylinder 2 is provided with the usual discharge valves Tand 8 at its inner and outer ends. The low pressure cylinder 1 is shown as provided with four auxiliary receivers, the auxiliary receivers 9 and 10 communicating with the inner end oi the cylinder and the auxiliary receiyers 11 and 12- comnuinicating with the outer end of said cyliuderfl he highpressure cylinder 2 is shown as sin'iilarly provided with four auxiliary reecivers the auxiliary receivers 13, H. communicating with the inner end of the cylinder and the receivers 15, 16, communicating with the outer end. of the said cylinder. Con' munication between these several auxiliary receivers and the. interiorsofthe c linders l and 2 is opened and closed'by auxiliary receiver valves 17, 18, .19, 20, 21

22, 23, 24. These auxiliary receiver, valves.

are opened by spring pressure and closed by} fluid pressure, in the present instance re,- ceiver pressure and in the present instance the regulator for controlling the loading and unloading of these auxiliary receiver valves is shown as arranged to load or unload the pumping mechanism of the compressor in four distinct steps at successively attained pressures, an auxiliary receiver valve'upon,

one side of one cylinder being simultaneously loa dedor unloaded with an auxiliary receiver valve upon the opposite side of the other cylinder."

Comim'znication, is established between the regulator and the auxiliary receiver valves 17 and through the common pipe and its branches; con'zmunication is established between the regulator and, the auxiliary receiver valves 19 and 22 through the common pipe and its branches; communication is estahlished'between. the regulator and the -the base of the valve chest 33. 40 port 55 of the valve 34 opens directly into auxiliary receiver valves 18 and 23 through the common-pipe 27 and its branches; and communication is established between the regulator and the auxiliary receiver valves 20, 21, through the common pipe 28 and its branches. Each auxiliary receiver valve is constructed as shown detail in Fig. 2, the valve stem 29 being provided with a piston 30 fitted to slide in a-ohamber 31, which chamber is brought into and out of communication with fluid pressure, in the pres ent instance the receiver pressure, by the regulator to be hereinafter specifically dc scribed. One or more springs 32 serve to 5 open the valve when fluid pressure is removed from the chamber 31. The auxiliary receiver valves are thus positively opened and closed.

I will now proceed to describe the fluid 2 pressure governed regulator for loading and unloading the auxiliary receiver valve as diflerent successively attained pressures are reached. The main valve chest 33 of the regulator is provided with four main regulator valves 34, 35,36, 37, having double headed pistons 38, 39, 40, 41, respectively. The spaces between the heads of the several pistons are at all times open to receiver pressure through ports 42, 43, 44, 45, opening '1I1t0 a common port 46 in the port plate 47 which port 46 is connected to a pipe 48 leading from the receiver not shown herein. The main regulator valve ports 49, 50, 51, for the valves 35, 36, 37, are at all times in open communication with the common port 52, which port 52 is at all times in open communication with external atmosphere through'the port 53 of the chamber 54 in The valve the said chamber 54. The pipes 25, 26, 27, 28, are provided with main. regulator valve ports 56, 57, 58, 59, controlled by the main regulator valves, 34, 35, 36, 37, respectively.

4.5 These main regulator valves are provided with bridge ports 60,61, 62, 63. When these main regulator valves are at the limits of their movements in one direction the ports 56, 57,58, 59, will be open to receive pressure thus throwing the load onto the auxiliary receiver valves 17, 18, 19, 20, 21, 22, 23, 24. When the main regulator valves are at the limits of their movements in the other direction the several ports 56, 57 58, 59, Wlll be brought into open communicationwith expresent instance, as constructed, arranged and operated as follows: A chamber 66 is provided in the top of the main valve chest 33, which chamber is at all times open to receiver pressure through the passage 67. This chamber is provided with a flexible diaphragm 68, which diaphragm receives the weight of a lever 69 through connecting pieces 70, 7 1. This lever 69 is pivoted at 72 onthe top 73 of the main valve chest 33. A graduated resistance is provided for the lever 69, which resistance is herein shown as a series of weights 74 adjustable along the lever 69 combined with a spring resistance including a spring holder 75, a depending rod 76, a lever stop 77 adjustable on said rod within the' holder and a spring 78 interposed betivecn the holder 75 and the stop This weighted lever 69 operates the means which controls the movements of the main valves, which means, in the present ber 81 by the lever 69 througha valve rod" 82 and link The inner end of a valve guide screw 84 enters a longitudinally elongated slot 85 in the auxiliary valve 79 for preventing the valve from turning. The chamber 81, beyond the heads 86, 87, of the auxiliary valve, is at all times inopen communication with external atmosphere through passages 88, 89, leading to the common port 52 hercinl'iet'ore referred to. The receiver pressure is admitted to the-space around the reduced bodyv portion of the auxiliary valve between its heads 86, 87, through a passage 90, said reduced body portion forming a bridge port. The inner wall of the auxiliary valve chest is provided with 'thi'ouglrports 91, 92, 93,- 94, which are in open communication by means of passages I 95, 96, 97, 98, in the port plate 47, with ports 99, 100, 101, 102, at the corresponding ends of the main regulator valve pistons 38, 39, 40,41. The inner wall of the auxiliary valve chest 80 is also provided with through ports 103, 104, 105, 106, which are in open communication by means of passages 107, 108, 109, 110, in the port plate 47, with ports 111,"

112, 113, 114, on the opposite side of the main regulator valve pistons 38, 39, 40, 41. The operation of the fluid pressure governed regulator is as follows: When the parts are in their normal position shown in the accompanying drawings, with the auxiliary valve 79 at the limit of its downward movement, the ports 91, 92, 93, 94, and thereby the ports 99, 100, 101, 102, will be open to external atmosphere; and theports 103, 104, 105, 106, and thereby the ports 111, 112, 113', 114, will be opened to receiver pressure. The main regulator valves 34,35, 36, 37, will thus be held at the limits of their move- .mcnts in a direction which illopen the sevoral auxiliary receiver valves to receiver pressure and thus hold the said auxiliary re- I ceivcr valves closed andthe pumping mechanism of the compressor loaded. "As there ceiver pressure begins to rise it will act upon the diaphragm 68 thus raising the lever 69.

I hen the lever has been raiseda predeter' mined distance, the auxiliary valve 79 will have been. moved into a position to open the port 91 and thereby the port 99 to receiver pressure and at the sa-metime open the port 103 and thereby the port 111 to external atmosphorc. This conditionwill cause the main-regulator valve 34 to he moved to the limit of its movement in the other direction thus unloading the auxiliary receiver valves 17 ,'2-l, upon opposite sides of the low and high pressure'cylinders, by removing the receiver pressure from. their pistons 30 and permitting their springs 32 to open the said valves. If the receiver pressure still continues to rise after this partial unloading of. the

pumping mechanism, the next set of auxilw iary receiver val vcs 19, 22, will be unloaded. A still further rise in pressure will unload the auxiliary receiver valves 18, 23, and a still further rise in receiver pressure will unload the auxiliary receiver valves 20, 21.

A fall in receiver pressure will successively load the said pairs of auxiliary receiver valves at successively" attained pressures until the pumping mechanism is fully loaded.

While I have shown and described a mechanism for loading and unloading a fluid compressor in four steps I do not wish to be limited to any particular number of steps.

It will he sen that by the mechanism herein shown and described I am enabled to load and unload'a compound fluid compressor: by a device controlled only by variations in the receiver pressure without the morecomplex piping and connections required where lntercooler pressure 15 also utlllzed Attention is calledito my vcopending applications-filed November 20, 1908, Serial Nos. 463,603 and 463,604, which are directed to the loading and unloading of both single and compound fluid compressors by a single fluid pressure governed regulator arranged to unload and load the valves of auxiliary receivers the receiver pressure rises and falls; distinguished from this p1 sent ap plication which is directed to combinations which include means for positively opening the auxiliary rcceiver yalve combined with pressure fluid operated means for closing the said valve and to combinations with compound fluid cpinpressors of means for connecting said pressure fluid operated means either to receiver pressure or to at- B osphere. Y

, It is evident that various changes might heresorted to in the form, construction and a arrangement of the several parts without departing from the spirit and scope of my l invention; hence I do not wish to limit my-i golf strictly to the structure herein set forth,. at I p I "What I claim is g l. The combination'ivith the cylinder of a fluid compressor, of an auxiliary receiver,

a valve connecting the cylinder and auxiliary receiver, pressure fluid operated means trolled means for-connecting said pressure;

fluid operated means either to 7 receiver pressure or to atmosphere. i

3. The combination with thecylinder of'a fluid compressor, of an'nuxiliaryreceiver, a-'

valve connecting the cylinder and auxilia'ry' receiver, pressure fluid op'erated means for closing said valve, a spring for positively openin said valve and means for c0nncct-' ing said pressure fluid ,operatcdmeans either to receiver pressure orto atmosphere;

4. The combination with the cylinder of a fluid compressor, of an auxiliary receiver, a

valve connecting the cylinder and auxiliary receiver, pressure fluid operated means for closingsaid valve, a spring for positively opening said valve and fluld pressure controlled means for connecting said pressure fluid operated means either to receiver pressure or'to atmosphere.

, 5.. The comhination'ivith the cylinder of a fluid compressor, oi an auxiliary receiver, a

valve connecting the cylinder and auxiliary receiver, said valve havinga pressure fluid operated piston, means for pos1t1 v'el y open?- ing the valve andmcans for connecting said piston cit-her to receiver pressure or to atmosphere,

6. The combination with the high and low pressure cylinders of a compound fluid compressor, of auxiliary receivers, waives for opening and closing communlcatlon between the cylinders and their auxiliary receivers and a regulator arranged to open the auxiliary receiver valves of both the high and low pressure cylinders either to receiver pressure or to atmosphere; 1

7. The combination with the high and low pressure cylinders of a compound fluid compressor, of auxiliary. receivers, valves tween the cylinders and their auxiliary rcccivers'and a regulator comprising aplu rality of main valves arranged to :open the auxiliary receiver valves of both the high for g. 0138111115; and closing communication Y be and low pressure cylinders either to receiver pressure or to atmosphere and means for controlling the. movements pf, said main regulator valves. v

8. The combination with the high and low pressure cylinders of a compound fluid compressor, of auxiliary receivers, valves for opening and clos ng communicationihe tween the cylinders and their auxiliary receivers and a regulator comprisingfra plurality of ma'in valves arranged to open the auxiliary receiver valves of both the high and low pressure cylinders either to receiver pressure or to atmosphere, and fluid pressure operated means for controlling the movements of the said main regulator valves.

9. The con'ibination with the high and low pressure cylinders ota compound fluid compressor, of auxiliary receivers, valves fomopening and closing communication between the cylinders and their auxiliary receivers and 'a regulator comprising a plurality of main valves arranged to open the auxiliary receiver valves of both the high and low pressure cylinders either to receiver pressure or to atmosphere and a single auxiliary valve for controlling the movements of the said main regulator valves.

10. The combination with the high and low pressure cylinders of a compound fluid compressor, of auxiliary receivers, valves for opening and closing communication between the cylinders and. their auxiliary-re.--

ceivers and a regulator com "Jrisim a lur b ralil of main valves arranged to open the.

auxiliary l't'POlYOl valves of- -both the high and low pressure cylinders either to receiver pressure or to atmosphere, a single auxiliary valve for controlling the movements of the said main regulator valves and a fluid pressure operated lever for moving the auxiliary valve.

11. The r,-oml ination with the high and low pressure evlinders of a compound fluid com 'nressor, of auxiliary receivers for the low pressure cylimler, valves ,;for opening and closing cmmnni'iication hehvcen the low pressure cylinder andits auxiliary receivers and a regulator arranged to open said auxiliary receiver valves either to receiver pressure or to atn'iosphere.

12. The combination with the high and low pressure cylinders of a compound fluid compressor, of auxiliary receivers for the low pressure cylinder, valves for opening and closing con'imunicatirm between the low pressure cylinder and its auxiliary receivers and a regulator comprising a plurality of main valves arranged to open the auxiliary receiver valves either to receiver pressure or to atmosphere and means for tontrolling the movements of the said main valves.

13.'The combination with the high and low pressure cylinders of a compound fluid compressor, of auxiliary receivers for the low pressure cylinder, valves for opening and closing communicationbetween the'low pressure cylinder and its auxiliary receivers and aregulator comprising a plurality of main valves arranged to open the auxiliary,

low pressure cylinder, valves for opening and closing communication between the low pressure cylinder and its auxiliary receivers and a regulator comprising a plurality of main valves arranged to open the auxiliary receiver valves either to receiver pressure or to atmosphere and a singl auxiliary valve for controlling the movements of the said main valves. I

15. The combination with the high and low pressure cylinders of'a compound fluid compressor, of auxiliary receivers for the low pressure cylinder, valves for opening and closing communication betweenthe low pressure cylinder and its auxiliary receivers and a regulator comprising a plurality ofv main valves arranged to open the auxiliary receiver valves either to receiver pressure or to atmosphere and a fluid pressure operated lever for moving the, auxiliary valve. I

16. The combination with the high and low pressure cylinders of a compound fluid compressor, of auxiliary receivers therefor, auxiliary receiver valves, a common source of fluid pressure for said auxiliary receiver valves, and'a regulator having respectively a port communicating With an auxiliary receiver valve of each cylinder, a fluid pressure supply port, and an exhaust port to external atmosphere, a main valve and means forcontrolling the movements of the said main valve for opening said auxiliary receiver valves either to fluid pressure or to atmosphere for loading and unloading said auxiliary receiver valves.

1-7. The combination with the high and low pressure cylinders of a compound fluid compressor, of auxiliary, receivers therefor,

auxiliary receiver valves and a regulator having respectively a port communicating With an auxiliary receiver valve of each cylinder, a receiver pressure supply port, and an exhaust port to external atmosphere, a main valve and means for controlling the movements of the said main valve for opening said auxiliary receiver valves either to receiver pressure or to atmosphere for loading and unloadlng said auxilmry recelver valves.

18. The combination with the high and the said valves whereb the an low pressure cylinders of a compound fluid compressor, of auxiliary receivers therefor, auxiliary receiver valves, a common source of fluid pressure for said auxiliary receiver valves, a regulator comprising a plurality of main valveseach having a port commnr eating with an atniiliary receiver valve o port here 3 {If .r'y receiver valves may be opened to one pres sure or to external. atmosphere for loading and unloading said maxillary receiver and means forveontrelllng the mo valves.

19. The combination with the high. anti 'low pressure cylinders of a compoimrl fimel compressor, of auxiliary receivers ther for, auxiliary receiver valves, a regulator com.- .rising a plurality of main valves each liar" mg a port commrmieating with an auxiliar receiver vvalve of each cylinder, a receiver pressure supply port, and an exhaust port, to external atmosphere and means for 301% trolling the movements of the saicl valves whereby the auxiliary receiver valves-,may he opened to receiver pressure or to external atmosphere for loading anclunloeding said auxiliary receiver valves. a

20, The combination with the high anti low pressure cylinders of a'componnol fluirl I compressor, of auxlliary receivers for the lowrpressnre cylinder, auxiliary receiver 'valves and a regulator having respectively .oontrolling the movements of the main valve to open the auxiliary receiver valve either to receiver pressure or to atrilosphere for loading and unloading saiclfanxiliary receiver valve.

The combination with-the high and low pressure cylinders of a compound fluid compressor, of auxiliary receivers for the low pressure cylinder, auxiliary receiver valves and a regulator comprising a plurality of main valves each having an auxiliary receiver valve port,'a receiver pressure supply port and an exhaust portto atmosphere, and means for controlling the movements of the saicl'ni aih-valves for open ing; the auxiliary receiver valves either to receiver pressure or to atmosphere for load; and unloading-said valves,

In testin'rony that 1 claim the foregoing my inventioinl have signed my name in presence of two witnesses, this twenty fourth day of February 1911.

7 WILLIAM PRELLWITZ Witnesses;

F. Gnome BARRY, C. S. SUNDGREN. 

